DETERMINATION OF NONSYMMETRIC DIMETHYL HYDRAZINE IN SOLUTIONS BY THE METHOD OF RESONANCE RAMAN-SCATTERING

A method based on the resonance Raman scattering is proposed for deter mination of traces of nonsymmetric dimethyl hydrazine (NDMH) in soluti ons. The method is especially sensitive to compounds possessing intens e absorption bands in the electronic spectra and low quantum yield of fluorescence. The Raman transitions were excited in the absorption ban d of the product of photocolorimetric reaction of NDMH with para-nitro benzaldehyde (PNBA), which served as an indicator reagent. For excitat ion at a wavelength of 457.9 nm, the lower detection limit of NDMH in solution is about 0.02 mg/l.